The purchase link in the Realmac Squash demo version (Powerful Batch Photo Editor for Mac - Squash) does not work and displays a “The requested URL was not found on this server” error.
@dan this was for you
Hi @CyberFredje
The broken link should be fixed now. Thanks for bringing it to our attention. 
Manual is okay, but not YouTube … https://www.realmacsoftware.com/elements/youtube - and now it’s fixed.
I can recommend Integrity (free) or Integrity Plus to check for broken links on your website(s) - Website link checker and XML sitemap generator for Mac and Macbook : Integrity Plus. Entirely Human-written software - It’s especially useful if you have many external links.
Temporary fix in place. @tpbradley can update the links in the app for a permanent fix. 